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1 =========================================================
2 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
3 =========================================================
4
5
6 Example factory
7
8 I. Hrivnacova,
9 Institut de Physique Nucléaire (IPNO), Université Paris-Sud, CNRS-IN2P3
10 Based on Hadr00 by V. Ivantchenko, CERN
11
12
13 Examples in the physicslist category show the possible ways how to define
14 a physics list from Geant4 physics constructors. This example demonstrates
15 the usage of G4PhysListFactory to build the concrete physics list.
16
17 Physics List can be defined by its name given by the -p argument of the of the
18 run command or by the PHYSLIST environment variable.
19
20 ./factory -m run.mac [ -p QGSP_BERT ]
21
22 By default, FTFP_BERT Physics List will be instantiated if
23 -p argument is not set and the PHYSLIST environment variable is not defined.
24
25 The same experimental setup is used for all examples in the physicslist category:
26
27 1- Detector description
28 -----------------------
29
30 The geometry (defined in the DetectorConstruction class) consists in a box of scintillator material (CsI) followed by a thin box of air (screen) which is used to simplify scoring.
31
32
33 2- Primary generator
34 --------------------
35
36 The primary generator is defined with usage of G4ParticleGun.
37 The default particle is proton which hits the box perpendicular to the input face.
38 The type of the particle and its energy are set in the PrimaryGeneratorAction class, and can
39 be changed via the G4 built-in commands of the G4ParticleGun class.
40
41
42 3- Scoring (ntuples)
43 --------------------
44
45 The screen volume is associated with a sensitive detector, ScreenSD,
46 which accounts the following particle properties:
47 - trackID
48 - particle PDG encoding
49 - particle kinetic energy
50 - particle X,Y position
51 - particle time
52
53 The scored quantities are filled in the Screen ntuple, which is defined using G4AnalysisManager
54 in RunAction class. The ntuple is saved in a Root file, which name is set to be equal to the
55 example name in main () function.
56
57 4- How to build
58 ----------------
59
60 An additional step is needed when building the example with GNUmake
61 due to using the extra shared directory:
62 % cd path_to_example/example
63 % gmake setup
64 % gmake
65
66 This will copy the files from shared in the example include and src;
67 to remove these files:
68 % gmake clean_setup
69
